Choose the correct item.

1 Mr Thomson ... swim for two hours non-stop when he was young.
A was able
B should
C could

2 Deforestation......be controlled in order for the planet's ecosystem to recover.
A may
B would
C must



3 We..........use biodegradable products as they don't harm the environment.
A should
B ought
C shall

4 Some experts believe that colonising space........ solve the problem of overpopulation on Earth
A might
B must
C need

5. You......... throw litter on the street. You'll get a fine.
A needn't
B mustn't
C couldn't

6 ....... I close the window? It's a bit chilly in here.
A Must
B Will
C May

7 They pay admission to the museum because it was free that day.
A needn't
B mustn't
C didn't need to


8 Hurry up! We..........be at the station by 7:00 or we'll miss our train.
A must
B can
C may

9 Allan says he..........do his school project on water pollution, but he's not sure yet
A will
B might
C can

10 Samantha......... watch the documentary on space exploration because her TV was broken.
A might not
B wouldn't
C couldn't